摘要
[目的]研究中国沙棘(Hippophae rhamnoides ssp.sinensis)、太阳沙棘(Hippophae rhamnoides ssp.taiyang)、乌兰沙林沙棘(Hippophae rhamnoides ssp.mongolica“Wulanshalin”)在砒砂岩区的根系分布特征及林下土壤抗蚀性特征,为改善当地生态环境提供新的树种选择。[方法]在野外挖土壤剖面获取根土复合体,在室内进行根扫描及崩解试验。[结果]①沙棘根系垂直分布规律大致相似。随土层深度的增加,根长、根体积逐步减少。根系主要分布在0-60 cm土层,占总根量比例分别为90.96%(中国沙棘),83.38%(太阳沙棘),74.93%(乌兰沙林沙棘);粗根主要分布在0-40 cm土层。水平方向粗根主要分布在距根基0-20 cm的范围内,细根主要分布在20-100 cm范围内,且距根基越远细根含量越少,根系整体呈浅层化分布。②沙棘林下土壤崩解速度变化趋势基本一致。以0-20 cm表层土平均崩解速度最低。随着深度增加逐步增大,水平方向距根基部越远土壤平均崩解速度越大。土壤崩解速度表现为:中国沙棘(3.18 g/s)>太阳沙棘(1.27 g/s)>乌兰沙林沙棘(1.21 g/s)。③土壤崩解速度与沙棘根系分布有显著相关关系。垂直方向上受到粗根和细根的共同影响,水平方向主要受到细根的影响,细根对固持水土的作用更大。[结论]太阳沙棘的根系含量高于乌兰沙林沙棘,且根系分布特征和林下土壤崩解速度变化规律联系更密切,更适用于砒砂岩区的水土流失防治工作。
[Objective]The root distribution characteristics of Hippophae rhamnoides ssp.sinensis,Hippophae rhamnoides ssp.taiyang,and H.rhamnoides ssp.mongolica“Wulanshalin”in a feldspathic area,and the characteristics of soil erosion resistance under the forests were analyzed in order to provide new tree species options for improving the local ecological environment.[Methods]The soil profiles were excavated in the field to obtain the root-soil complexes,and the root scanning and disintegration test were performed indoors.[Results]①The vertical distribution patterns of roots for the three seabuckthorn species were similar.Root length and root volume gradually decreased with increasing soil depth,and roots were mainly located in the 0-60 cm soil layer,accounting for 90.96%of the total root amount for H.rhamnoides ssp.sinensis,83.38%for H.rhamnoides ssp.taiyang,and 74.93%for H.rhamnoides ssp.mongolica“Wulanshalin”.Thick roots were mainly located in the 0-40 cm soil layer.The thick roots in the horizontal direction were mainly located in the range of 0-20 cm from the base of the plant,and the fine roots were mainly located in the range of 20-100 cm.The farther away from the base,the fewer the fine roots.The overall root system was distributed in a shallow layer.②The change trend of soil disintegration rate under the H.rhamnoides forest was basically the same.The average disintegration rate of the surface soil at 0-20 cm was the lowest,and the rate gradually increased with increasing depth.In the horizontal direction,the farther away from the base of the plant,the greater the average disintegration rate of the soil.The soil disintegration rate followed the order of:H.rhamnoides ssp.sinensis(3.18 g/s)>H.rhamnoides ssp.taiyang(1.27 g/s)>H.rhamnoides ssp.mongolica“Wulanshalin”(1.21 g/s).③There was a significant correlation between soil disintegration rate and root distribution of seabuckthorn.In the vertical direction,it was affected by both coarse and fine roots,while in the horizontal direction,it was mainly af
作者
卜繁靖
郭月峰
祁伟
张燕
王皓月
祁慧娟
Bu Fanjing;Guo Yuefeng;Qi Wei;Zhang Yan;Wang Haoyue;Qi Huijuan(College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot,Inner Mongolia 010010,China;Inner Mongolia Water Resources and Hydropower Survey and Design Institute,Hohhot,Inner Mongolia 010020,China;Ordos Forestry and Grassland Investigation and Investigation Center,Ordos,Inner Mongolia 017000,China)
出处
《水土保持通报》
CSCD
北大核心
2022年第5期41-48,56,共9页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目“内蒙古砒砂岩区沙棘平茬后林木根系与根际微环境的调节机制”(31960329)
内蒙古自治区科技计划项目“生态脆弱区人工灌木林保护技术研发与示范”(2021GG0085),“地区多功能树种选育及扩繁关键技术研究与示范项目”(2019GG004)。
关键词
砒砂岩区
沙棘
根系特征
崩解速度
feldspathic sandstone area
Hippophae rhamnoides
root system characteristics
disintegration rate
